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The leukapheresis product will undergo TCR alfa beta negative selection following the standardized protocol.

total nucleated cells from the leukapheresis product will undergo TCR alfa beta negative selection and the product of the depletion will be infused to the patient

TCR alfa beta T cell depletion

Franco Locatelli, Prof

Allocation: Non-Randomized Endpoint Classification: Safety/Feasibility Intervention Model: Single Group Assignment Masking: Open Label Primary Purpose: Treatment Study to assess the feasibility and safety of the infusion of a T cells receptor (TCR) alfa beta depleted graft in pediatric patients affected by malignant and non-malignant hematological disorders and receiving an Hematopoietic stem cell transplantation (HSCT) from a Human leukocyte antigen (HLA) partially matched family donor.

In this study the hypothesis is that the transplantation of Peripheral blood stem cells (PBSC)selectively depleted of TCR alfa beta T lymphocytes would offers some advantages over the use of positively selected CD34+ stem cells because of the presence of other non-stem ancillary cells (in particular Natural killer (NK) and alfa beta T cells) that might have potential positive effects on the outcome of the transplant.

The clinical relevance of NK-cell alloreactivity has been demonstrated in adult patients affected by Acute myeloid leukemia (AML) and given T-cell depleted HSCT from an HLA-disparate relative where a subgroup of patients had a particularly low risk of leukemia relapse. These patients belonged to the group transplanted from a donor having NK cells that were alloreactive towards recipient targets i.e. the patient cells express HLA-class I alleles that do not share the inhibiting allelic determinants recognized by Killer immunoglobulin-like receptors (KIR) on donor NK cells. The emergence of this concept of NK-cell alloreactivity has represented a sort of revolution in the field of Haplo-identical hematopoietic stem cell translantation (haplo-HSCT), as the presence of alloreactive NK cells has been shown to positively affect the outcome of transplantation in adults and to display a Graft versus leukemia (GvL) effect that can compensate for the lack of T-specific anti-tumor effect.

The purpose of this study is to evaluate the feasibility and safety of the selective infusion of TCR alfa beta T cell depleted graft in pediatric patients affected by malignant or non malignant hematological disorders and receiving an HSCT from a partially matched family donor.

This study will provide new data on the feasibility and the safety of using a TCR alfa beta T cell depleted graft instead of fully T cell depleted graft to improve the outcome of patients receiving a haplo-HSCT for the treatment of hematological disorders.

Trial to Assess the Efficacy of a TCR Alfa Beta Depleted Graft in Pediatric Affected by ALL or AML and Receiving an HSCT

Phase I/II Study of Allogeneic Hematopoietic Stem Cell Transplantation From an HLA-partially Matched Family Donor After TCR Alfa Beta Negative Selection in Pediatric Patients Affected by Hematological Disorders

Target number of CD34+ cells in at least 80% of the patients

Cumulative incidence of primary and secondary graft failure

Cumulative incidence and severity of acute and chronic GvHD occurring after the transplantation

The overall survival (OS) and disease-free survival probability compared with a cohort of historical controls

The immunological reconstitution of TCR alfa beta cells compared with a cohort of historical controls

Mariella Enoc

Director Department of Pediatric Hematology and Oncology

Spots Global Cancer Trial Database for tcr alfa beta t cell depletion